SEO For Sport Betting Site

I have a football tipping website which I need onsite and offsite seo doing for.
Currently the site is ranked around 60th for it's primary keyword and it's an exact match .com domain.
I have done a small amount of link building (guest blogging etc) but the site hasn't improved much.
The site gets 2 well written articles posted per week as well as constant social media updating.
Please send me a message for the site URL and desired keyword as I'd rather not make it public.
Please make a bid for the total cost of SEO with escrow being released when the site makes either top 5 or top 10 (we can discuss this)